Title: The Influence of an Adsorbate Layer on Adatom Diffusion and Island Nucleation: Fe on Si(111)-root 3 x root 3-Au
Authors: Paredis, Kristof ×
Smeets, Dries
Vantomme, André #
Issue Date: Dec-2009
Publisher: Springer New York LLC
Series Title: Nanoscale Research Letters vol:4 issue:12 pages:1447-1451
Abstract: Using scanning tunneling microscopy, the influence of a thin Au layer on the diffusion of Fe adatoms and the subsequent island nucleation on a Si(111) surface is investigated. The adsorbate induces the Si(111)-root 3 x root 3-Au structure that increases the surface mobility of subsequently deposited Fe atoms, resulting in the formation well-defined nanoclusters. Surprisingly, the domain walls-inherent to the root 3 x root 3-Au reconstruction-do not influence the surface diffusion, which demonstrates that the passivation is of much more importance for the self-assembly than the surface corrugation. Using the decoupling of the diffusion and nucleation on the surface and the reaction with the surface and conventional nucleation theory, the activation energy for surface diffusion E-d = 0.61 eV and the critical cluster size i = 3 are determined, which reveal the microscopic details of the diffusion and nucleation processes.
ISSN: 1556-276X
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Nuclear and Radiation Physics Section
× corresponding author
# (joint) last author

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